A throwaway address (also called disposable or burner) is a temporary inbox that someone creates to get past a sign-up form and then abandons within minutes or hours. They are designed to disappear.
Why they are marked do-not-send
Mail to a throwaway address goes nowhere useful — the person is not really there. Keeping these on your list adds bounces and hurts your sending reputation, with no upside. So we mark them do-not-send.
Note
We keep our knowledge of throwaway providers up to date constantly, because new ones appear all the time. This check runs on every address at no extra cost.
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